em,
i {
    font-style: normal;
}

button {
    cursor: pointer;
}


/* 初始化样式 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

a {
    text-decoration: none;
}

li {
    list-style: none;
}

img {
    border: 0;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.w {
    width: 1200px;
    margin: 0 auto;
}

body {
    background-color: #f3f5f7;
    height: 3500px;
}

.position {
    position: relative;
}

input,
button {
    border: none;
    outline: none;
}


/* 清除浮动 */

.clearfix::after {
    content: '';
    display: block;
    clear: both;
}